Ventilator



W. MITCHELL.

VENTILATOR.

APPLICATION FILED 050.29. 1919.

Patented June 28, 1921.

UNITED STATES PATENT oEEicE.

WILLIAM MITCHELL, oE MILWAUKEE, WISCONSIN, AsSIeNoE To MITCHELL MANU- FACTURING COMPANY, 0E MILWAUKEE, WISCONSIN, A CORPORATION 0E WIS- CON SIN.

T0 all whom t may concer/n Be it known that I, WILLIAM MITCHELL, a citizen of the United States, and resident of Milwaukee, in the county of Milwaukee and State of Wisconsin, have invented new and useful Improvements in Ventilators, of which the following is a description, reference being had to the accompanying drawings, which are a part of this specification.

The present invention relates to certain new and useful improvements in ventilators orv cowls which are more particularly designed for automatically Ventilating the interior of a building or other space, and which are provided with means whereby the ventilator is automatically shifted into a position in which the wind will operate upon the same for effectively withdrawing the foul air from the building. p

It is one object of this invention to provide a ventilator of this character so constructed that rain, snow, or any other foreign matter will be prevented from falling into the air shaft or vent.

This invention has for another object to provide a ventilator so constructed that a shaft of air will practically surround the discharge mouth of the air vent or shaft,

` whereby a strong suction effect is produced to eiiiciently withdraw the foulair from the building upon which the ventilator is employed.

My vinvention has for a further object to provide a novel form of brace and journaled support for the horizontal hood or cowl supporting shaft.

It is a still further object of this invention to provide a ventilator or cowl of the character described which will be of simple and efficient construction.

vWith the above and other objects in view which will appear as the description proceeds, my invention resides in the novel construction, combination and arrangements of parts, substantially as hereinafter described and more particularly defined by the appended claims, it being understood that such changes in the precise embodiment of the hereindisclosed invention may be made as come within the scope of the claims.

In the accompanying drawing I have illustrated one complete example of the physical embodiment of my invention constructed ac- Applcation led.y December 29, 1919. Serial No. 348,159.

VENTILAToR.

Specification of Letters Patent. Patented June 28, 1921.

cording to the best mode I have so far devised 'for the practical application `of the principles thereof, and in which- 1 VFigure 1 is a view of a ventilator embodying the features of my invention, parts being broken away and in section to more clearly illustrate the details of construction.

Fig. 2 is a view looking at the end of the ventilator cowl or horizontal hood which is normally positioned to the wind at all times, said view being taken on the plane indicated by the line 2 2 of Fig. l1. V v

Fig. 3 is a transverse sectional view taken through the air shaft or vent, taken on the line 3-3 of Fig. 1. Y

Fig. 4 is a detail sectional View of the4 novel form of combined brace and journal for cowl or hood supporting shaft,land

F ig. 5 is a view similarto Fig. 4 of vthe lowermost brace end journal illustrating the novel form of end thrust bearing I provide.

Referring now more particularly to the drawing, designates the ventilatorv cowl proper which is rotatably supported above an air shaft or vent B.

The cowl A is in the form of a. substantially horizontal hood open at both ends, and having an opening 10 in its underside adapted for communication with the air shaftfB, and provided with depending annular flange .11', surrounding the opening 10 for extending part way over the upper end of the air vent or shaft B.-

The hood is rotatably mounted upon a verticalsupporting Shaft 12 mounted in suitable bearings 13 and 14, to be later described, and has its upper end engaged with the 'top wall of the hood A, as at 14', and its intermediate portion passed through the bore of a channeled brace member 15 secured to the bottom wall of the hood A, the said shaft being secured therein by means of a set screw 16.- lhe bearings 13 and 14 consist of ball bearings disposed within centrally bored 'bracket members 17 provided with radially extending arms 18 from which extend adjustable securing braces 19 having their outerends secured to the air vent or shaft B, as best shown in Figs. 1 and k3. The ball bearings are secured Within the bore by means of an upper and a lower plate 20 and the lowermost plate 2O is centrally depressed as at 21 to receive an end thrust ball bearing 22.

An inner elbow section 23 is secured within the hood A and has one end 24 incommunication with the opening l() in the hood and consequently the air shaft B and its other end 25 spaced a slight distance from one'of the open ends of the hood. The rear wall 26 of the elbow section is inclined in-lv wardly and upwardly from the other o env f end of the hood A, and asbest shown n Big.

2, and the top and side walls of the section 23 are spaced from the top and side walls of the hood to provide an airpassageway 27.

yBy this construction it will be readily seen that the air-y current enters the hood A,

through its end adjacent rear wall 2O of theV elbow section, and passes through the air passageway`27 at a high speed, and, as thev same completely surrounds the mouth of the inner elbow section 23, a very strong suction is formed to efliciently draw the foul air from vthe building upon which the ventilator is employed.. In order that the end of the hood A adjacent the wall 26 of the elbow will always be positionedinto the wind, a'

, .which also provide means for bracingv the` vane'28 isl provided having its supporting rod 29 passed centrally throughY the hood A and secured therein by bracket arms 30 hood.

'Fronilthe-foregoing description taken inY connection with the accompanying drawingl l. A ventilator comprising a substantially' vertical `air-shaft, a substantially horizontal open ended hood rotatably mounted above the air shaft and .having a bottom opening inregister with said shaft, a substantially inverted U-shaped section positioned within the hood andhaving its ends secured therein with its outer end terminating near one end of the hood, a wall closing the inner end of said section and inclined from the top of said section at a point near the axis of said vertical shaft to a point outwardly of the hood bottom opening, the side and top walls of said section being spaced from the side and top walls of said hood whereby air entering the end of the hood adjacent Vthe closed end ,of said section will be formed into a tubular column 'to'create a suction within theV open end of said section, and means whereby the end of said hood adjacent the closed end of said section will be held into the wind. I

2. A ventilator comprising a substantially vertical air shaft, a supporting rod centrally carried by said shaft with its end extended thereabove, a substantially horizontal hood member rotatably supported above the shaft by said rod and having a bottom opening in register with said shaft, a substantiallyv inverted U-shaped section positioned within the hood and having its ends secured therein with its outer end terminating near one end of the hood, a wall closing the inner end of said section and inclined from appoint at the top of said section adjacent the engagement of said rod with the hood to a point outwardly of the hood bottom opening, the side and top walls of said section being spaced from the side and top walls of Vsaid hood whereby air enteringthe end of the hood adjacent the closed end of said section will be formed into a tubularcolumn to create a suction within the open end oit' said section, the extreme upper end of said rod passing through an opening in the top of said section whereby the major portion will be shielded fromthe elements, and means whereby the end of saidhood adjacent the closed end of the section will be held into the wind.

In testimony whereof, I aix my signature. WILLIAM MITCHELL, 

